Resetting/bypassing P/OS password on DEC Pro 3xx series?

Anyone recall what the procedure is for resetting or bypassing the password on P/OS? I *know* I was able to find this out before (in 2008 or so) because I did it on another Pro 350 I have, but I cannot for the life of me find anyplace that documents the procedure (the FAQ (http://www.deccomputer.info/2012/05) has no useful suggestions). I recall it required booting from a special floppy that had a few filesystem tools that'd allow replacing the password file; I'm sure I still have the disk image but I have no idea which one it is. I guess I should have saved the instructions somewhere (or maybe I did and I simply can't find them!). I must be getting old. I have a new Pro 350 in my possession which has a PC compatibility card; I'd like to see if the hard drive contains software for it (or anything else interesting) before I wipe it...